Usually web developers buy all the TLD’s that they could grab to protect their brand identity. When you runs example business and using example.com as your website. Another company could run example.net to fake themselves as your business.
By using ‘Aliases Domain’ feature, you’re able to park a domain without adding any new content but showing existing content over the URL.
Login to your cPanel account.
On the ‘Domain’ section, click on the ‘Aliases’ icon.
Next page will present you with an input box to add your aliases domain. Enter your domain and click 'Add Domain'. Domain will be parked on your primary domain. 
